Here is a great article from CNET.

1. How do I upgrade to Windows 2000?
2. Will Windows 2000 support all my peripherals?
3. How do I set up Internet connection sharing?
4. Will my old DOS programs run?
5. How do I set up a dual-boot Windows 98-Windows 2000 system?
6. Can I return to Windows 95/98/NT once I upgrade?
7. Is Windows NT still an option?
8. Is Windows 2000 too buggy for my PC?
9. How do I get help with Windows 2000?
10. Does Windows 2000 support DVD?
Bonus question: What comes after Windows 2000?

http://www.cnet.com/software/0-1497797-7-1679790.html?tag=st.cn.1.tlpg.1497797-7-1679790